Suppose D were dominant and d were recessive,and you could label the D allele in the P generation with a radioactive substance that could be inherited over several generations.You create hybrids by mating your radioactive DD individuals to dd individuals.Finally,you cross two F1 individuals (with the Dd genotype).In 1,000 offspring,how many would you predict would be radioactive?

Question

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In the F1 generation, all individuals are Dd, with one radioactive D allele. When two F1 individuals mate, the genotypes of the offspring can be DD, Dd, or dd in a 1:2:1 ratio. Since both DD and Dd genotypes include at least one radioactive D allele, 75% (or 750 out of 1,000) of the offspring will inherit a radioactive allele.

Suppose D Were Dominant and D Were Recessive,and You Could